Stove oven



Aug.'22, 1939. R. w. HOFFMAN ET AL 2,170,409

- s'rovE OVEN ,Filed June 1, 1936 'kan ` INVENTORS ROBERT W. HOFF/WA4] OTTO FZ'JUENGER ATTORNEY PatentedAug. 22, 1939 l NITE-o -sTA'rEs PATENT OFFICE s'rova ovEN Robert W. Hoiman, St. Louis, Mo., and 0tto F.

Juenger, Belleville, Ill., asslgnors to Johns- Manville Corporation, New York, N. Y., a corporation oi New York Application June l, 1936, Serial No. 82,734

4 Claims. (Cl. 220-9) This invention relates to double-walled stove thereof is thermal insulating material I4 in the ovens or the like. y form of self-sustaining slabs or blocks.

Such structures ordinarily have sheet metal A desirable type of such insulation may be outer and inner casing members, thermal insuconstituted largely .of heat-'resistant fibres, such I lation therebetween, and bolts, rivets, or other as rock wool and/or asbestos, andaheat-resistant 5 highly conducting elements connecting the said binder bonding the fibres into a shape-retaining members and extending through the insulation. and relatively rigid unit. Such insulation is We have now discovered a convenient and commonly sold as stove insulation, an example simple insulated double wall structure which of which is' a mixture of asbestos and rock wool' makes possible the use of imperforate insulation, fibres bonded with clay. I lo so that there is no through metal contact be- In making such insulation, there may be tween the inside and the outside faces of the formed, on a rotary filter press, a lter cake oven, and which makes possible a convenient including a large proportion of asbestos and rock and simple assembly of the insulation and inner wool fibres, clay, and water. When the cake i casing members. vhas been built up to proper thickness, it is rel5 Not only is there a large reduction in heat moved from the iilter, shaped to approximately transfer in my improved oven, due to omitting ilat form, and dried at an'elevated temperature, the metal parts extending through the double to develop a bond in the clay. The resulting wall from face to face, but also there is avoidproduct is then trimmed to proper dimensions,

y ance, on the outside oi' the oven, of localized hot for insertion into the article of the present in- 20 spots adjacent to the termini of the conventional vention. metal elements extending through the wall. Disposed inside the said insulation is the inner These features are comprised Within the presbox-like casing of the article or assembly. This ent invention. Also, comprised with the invencasing includes the inner top member I5, which 5 tion is the supporting of an inside casing memis disposed just below the insulation under the 25) ber of the doublefwall upon shape-retaining intop of the outer casing. This member I5, in sulating material. An additional feature of the turn, is supported at its turned-down edge porinvention is the provision of means for holding tions I6 and il' Vupon the metal sheets I8 and I9 side members of the inner casing so that the constituting the inner side facing members of l saidrnembers cannot fall inwardly and their the oven. These sheets, suitably, are disposed 3o movement inwardly is restricted. Other features in contact with the side insulating slabs and are and advantages of the invention will appear from held apart, in spaced relationship t0 each other the detailed description that f0110ws, v and against the insulating side slabs, by means Y For the purpose of exempliflcatlon, the inven- 0f Spreades 0l' Spacing members 2l The Sheets i tion will be illustrated by reference to the oven are thus limited as'to inward movement and 35 of a gas-fired stove and, particularly, by referare prevented fr0!!! falling inwrdly- The Side ence to the attached drawing in which; and top members of the inner casing are inde- Fg 1 is a Sectional plan View of an oven (with pendent of each other, that is, arenot secured out the door and door accessories); i togethef' but may be inserted Separately and i Fig. 2 is a sectional elevational view of the mofed Independently with respect to each other 40 assembly of Fig l; and untilabutment results.

Fig. 3 is a sectional elevational view of a modi- Smtably these 'spreaders n are strips of iron' cation of the invention in which special means say angle irons which are engaged by suitable v clips ZI'. Such clips may include each a short I are associated with certain inner casing mem' strip of bent sheet iron secured at its lower por- 45 bers to' um the' inward' movement of other tion to the back (vertical) Wall of the oven and,

members. the casing' at lits top portion, spaced from the back wall, so There is shown an outer box-like casing, say, as to dene a Space of somewhat v shape of one of sheet steel, forming the two side portions cross section, in which space the lower parts i II and I2, respectively, and the top portion I 3 0f the angle bars 2U may be inserted. 50

of the outside casing of an oven. The back 'of At the front part of the oven, that is, near the the outer casing extends between the sides II door (not shown), the side members of the inner and I2 (Fig. 1) and downwardly from the top I3. casing are engaged by elements 22 which may be Disposed within this casing, extending thereover, hook-like or channel-shaped elements continui and, suitably, tting closely against all portions ous with and secured to the front portion of the 55 outer casing member. The elements 22 are preferably constituted of poorly conducting material resistant to deterioration at oven temperatures. Thus they may consist of fired clay ware.

The portion of the inner casing constituting the back member 23 is arranged, suitably, as illustrated, in contact with the rear insulating slab and held backwardly thereagainst by abutment with the rear edges of theside inner casing members.

The abutment of the inner side casing mem-A bers at their forward edges against elements 22 insuresthat therevis, at all times, rm contact of the rear parts of the said members against the inner rear facing member 23. l

In making an assembly such as illustrated in Figs. l and 2, it is convenient to have the insulating slabs slightly oversize, so that a slight pressure is required to force them 'into position inside the outer casing. In this manner, the units once forced into position, will stand by themselves for a short time, while the various parts of the inner casing are being introduced.

We have found it convenient to insert the top, side and back insulating slabs and the top inner casing member I5 before the inner side and rear facing members are introduced. The inner side facing members may be provided with conventional irregularities such as the recesses 28 for holding grids of usual type. Also, the bottom of the oven may be of usual design and may be provided with vents 21.

In comparing an oven ofthe kind described with conventional double-walled oven construc-` tion, involving through metal parts, we have found, in our improved oven, thermal insulating slabs weighing more' than 12 pounds to the cubic foot to be as satisfactory in' heat conservation as a conventional oven containing the usual through metal parts andhaving thermal insulation weighing only 6 pounds to the cubic foot.

In a modification of the invention shown in Fig. 3, the spreader parts 20 are omitted and are replaced by means associated with the inner top casing member for holding apart the inner side casing members. These .means include ribs 24 or other projections on the inner surface of the top inner casing member. Suitably, similar irregularities 25 are used also on thel bottomrof the oven. These ribs are spaced Iiust inside the inner surface of the side insulating slabs, so that when the side plates I8 and I9, which are somewhat springy, are forced therebehind, these side plates are snapped in position and locked behind the said ribs and against the inside of the insulating slabs. l

The opening 26 is for flue connection to the oven.

In general, the absence of perforations, that is, the continuity of the insulation between the corresponding parts of the outer and inner casings,

.necessitates that substantially all of the heat transferred through the wall must pass through the insulation. An exception is the small amount that may pass through the joints between adjacent insulating slabs. This part of the transferred heat is, however,.very small, inasmuch as thevarious slabs abut tightly at the joints'and are preferably yieldable or friable to the extent that the joints practically close themselves when v the various slabs are forced together as described.

It will be understood that the details given are .for the purpose of illustration, not restriction,

and that variations within the spirit of the invention are to be included in the scope ofthe appended claims.

What I claim is:

1. An oven comprising an outer box-like casing open at one side, shape-retaining insulating slabs tightly engaging within the casing to form a substantially selfsupporting insulation structure in contact with the top, back and sides of the outer casing, a sectional inner casing including independent top, back and side members overlying said insulation structure, the edges of said outerv casing at the open side thereof carrying insulating means receiving and holding in position the forward edges of the. side members of the inner casing whereby said edges of said side members are restrained from lateral movement, the inner back-member including means extending from its vertical edges engaging the rear edges of said side members to restrain them from outward movement, and meansremovably supported by said back member pressing the side members outwardly against said means on said back member to lock the side and back members in assembled relationship.

,Y 2. An oven comprising an outer box-like casing open at one side, shape-retaining insulating slabs tightly engaging within the casing to form a substantially self-supporting insulation structure in contact with the top, back and sides of the outer casing, a sectional inner casing including independent top, back and side members overlying said insulation structure, the edges of said outer casing at the open side thereof carrying insulating means receiving and holding in position the forward edges of the side members of the inner casing whereby said edges of said side members are restrained from lateral movement, the inner back member including flanges extending from its vertical edges engaging the rear edges of said side members to restrain them from outward movement, and means removably supported by said back member pressing the side members outwardly against said flanges to lock the side and back members in assembled relationship.

3. An oven comprising an outer box-like casing open at one side, shape-retaining insulating slabs tightly engaging within the casing to form a substantially self-supporting insulation structure in contact with the top, back and sides of the outer casing, a sectional inner casing including independent top, back and side members overlying said insulation structure, the edges of said outer engaging'the upper edges of the side wall members.

4. An oven comprising an outer box-like casing open at one side, shape-retaininginsulating slabs tightly engaging within the casing to form a substantially self-supporting insulation structure in contact with the top, back and sides of the outer casing, a sectional inner casing including independent top, back and side members overlying said .insulation structure, the edges of said outer casing at the open side thereof carrying insulating means receiving and holding in position the forward edges of the side members of the inner casing whereby said edges of said side members are restrained from lateral movement, the inner back member including means extending from its vertical edges engaging the rear edgesof said side members to restrain them from outward movement, and means removably supported by said back member pressing the side members outwardly against said means on said back member to lock the side and back members in assembled relationship, said side members contacting said insulation in limited areas only.

ROBERT W. HOFFMAN. OTTO F. JUENGER. 

